Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...

The original Insituform liner installed in the Brick Lane Sewer was examined in June 1991 and two
sample panels were removed from the lining by Insituform Permaline, Ltd., and placed in the custody of
MTS Pendar, Ltd., under the scrutiny of TW. The panels were cut from the sidewall of the liner along the
spring line of the sewer about 3 ft (900 mm) from the access manhole located in Riverside Close. The
location was revisited in October 2001 and two sample panels about 1 foot (300 mm) square were
removed from an area of the sidewall about 6 ft (1.83 m) into the sewer (Figure C-1). The second set of
samples was placed in the custody of Bodycote Materials Testing, Ltd. (owners of MTS Pendar). In each
instance, test pieces were machined from the test panels and tested for flexural strength and modulus in
accordance with the relevant testing specifications: BS 2782 Part 3 Method 335A:1978 in 1991 and
U.K.WIS 4-34-04/BS EN ISO 178 in 2001. The results of this retrospective evaluation spanning 20 to 30
years after the original CIPP installation are summarized in Table C-1.
Figure C-1. Sample Retrieval at the Brick Lane Sewer CIPP Project in Hackney, U.K.
Table C-1. Results of Brick Lane Sewer CIPP Retrospective Testing
Sample Mean Industry Standard
Flexural Property 20 Year 30 Year WIS4-34-04 ASTM F1216
Modulus, MPa 2,900 3,300 2,200 -
Modulus, psi 420,000 480,000 - 250,000
Strength, MPa 46 43 25 -
Strength, psi 6,700 6,200 - 4,500
C-2